As illustrated in Installation of your Linux Server, many network services including, but not limited, to telnet, rsh, rlogin, or rexec are vulnerable to electronic eavesdropping. As a consequence, anyone
who has access to any machine connected to the network can listen in on their communication and get your password, as well as any other private information that goes over the network in plain text. Currently the Telnet
program is indispensable for daily administration task, but is insecure since it transmits your password in plain text over the network and allows any listener to thereby use your account to do anything he likes. To
solve this problem we must find another way, or program, to replace it. Fortunately OpenSSH is a truly seamless and secure replacement of old, insecure and obsolete remote login programs such as telnet, rlogin, rsh, rdist,
or rcp.